package com.ilancuo.thinkinjava.chapter_18;

import java.io.*;

class Blip1 implements Externalizable {

    public Blip1() {
        System.out.println("Blips constructor");
    }

    @Override
    public void writeExternal(ObjectOutput out) throws IOException {
        System.out.println("Blip1 writeExternal");
    }

    @Override
    public void readExternal(ObjectInput in) throws IOException, ClassNotFoundException {
        System.out.println("Blip1 readExternal");
    }
}

class Blip2 implements Externalizable {

    Blip2() {
        System.out.println("Blip2 constructor");
    }

    @Override
    public void writeExternal(ObjectOutput out) throws IOException {
        System.out.println("Blip2 writeExternal");
    }

    @Override
    public void readExternal(ObjectInput in) throws IOException, ClassNotFoundException {
        System.out.println("Blip2 readExternal");
    }
}

public class Blips {
    public static void main(String[] args) throws IOException, ClassNotFoundException {
        System.out.println("Constructing objects:");
        Blip1 b1 = new Blip1();
        Blip2 b2 = new Blip2();
        ObjectOutputStream o = new ObjectOutputStream(new FileOutputStream("Blips.out"));
        System.out.println("Saving objects:");
        o.writeObject(b1);
        o.writeObject(b2);
        o.close();
        ObjectInputStream in = new ObjectInputStream(new FileInputStream("Blips.out"));
        System.out.println("Recovering b1:");
        b1 = (Blip1) in.readObject();
//        System.out.println("Recovering b2:");
//        b2 = (Blip2) in.readObject();
    }
}
/*
 * b2 无法恢复的原因：构造器不是public的
 */